Question

我创建了一个客户端 - 服务器应用程序，双方使用套接字连接和输入/输出流进行通信以发送/接收数据。这一切都很好但只有我只有一个使用连接的活动。由于我将在我的应用程序中不仅仅有一个活动，并且经过一些搜索后，我得出结论，我必须创建一个服务来处理套接字连接和从套接字流发送/接收。我之前从未使用过服务，我以为我会一步一步地开始。目前我刚刚创建了一个Service，它创建了我的Client类的实例（扩展了Thread）并启动了该线程，该线程建立了与服务器的连接。
我的客户班级
的 T_Client：

public class T_Client extends Thread {
    private static final String TAG = "T_Client";

    private static String serverIP = "192.168.2.3";
    private static int port = 4444;
    private InetAddress serverAddr = null;
    private Socket sock = null;
    private boolean running = false;
    private ObjectInputStream in;
    private ObjectOutputStream out;
    private Object objIn;

    public void send(MessageCustom _msg) {
        if (out != null) {
            try {
                out.writeObject(_msg);
                out.flush();

                Log.i("Send Method", "Outgoing : " + _msg.toString());
            } catch (IOException ex) {
                Log.e("Send Method", ex.toString());
            }
        }
    }

    public void stopClient() {
        Log.v(TAG,"stopClient method run");
        running = false;
    }

    @Override
    public void run() {
        running = true;
        try {
            serverAddr = InetAddress.getByName(serverIP);

            Log.i("TCP Client", "C: Connecting...");
            sock = new Socket(serverAddr, port);
            try {
                out = new ObjectOutputStream(sock.getOutputStream());

                in = new ObjectInputStream(sock.getInputStream());
                Log.i(TAG, "C: Connected.");
                while (running) {
                    objIn = in.readObject();
                    Log.i("Object Read Class", objIn.getClass().toString());
                    Log.i("Object Read", objIn.toString());
                }
                Log.e("RESPONSE FROM SERVER", "S: Received Message: '" + objIn + "'");
            } catch (Exception e) {
                Log.e(TAG, "S: Error", e);
            } finally {
                out.close();
                in.close();
                sock.close();
                Log.i(TAG, "Closing socket: " + sock);
            }
        } catch (Exception e) {
            Log.e(TAG, "C: Error", e);
        }
    }
}

我的服务类
的为MyService：

public class MyService extends Service {
    private static final String TAG = "MyService";

    private T_Client client;

    @Override
    public void onDestroy() {
        Log.v(TAG, "onDestroy");
            if (client != null) {
                try {
                client.stopClient();
                } catch (Exception e) {
                    Log.e(TAG, "Error on close: " + e);
                }
            }
        super.onDestroy();
        Toast.makeText(this, "Service stopped", Toast.LENGTH_LONG).show();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.v(TAG, "onStartCommand");

        client = new T_Client();
        client.start();

        Toast.makeText(this, "Service started", Toast.LENGTH_LONG).show();

        return START_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

}

目前我在主要活动中所做的只是使用开始和停止按钮来启动/停止服务

public void start(View v){
    Log.i(TAG,"Start pressed");

    Intent intent=new Intent(getBaseContext(),MyService.class);
    startService(intent);
}

public void stop(View v){
    Log.i(TAG,"Stop pressed");

    Intent intent=new Intent(getBaseContext(),MyService.class);
    stopService(intent);
}

所以我的问题是：

使用我的服务发送内容需要做什么？
如何处理从服务器读取的对象，以便我可以让应用程序知道实时收到了什么内容？

非常感谢任何可以指导我解决问题的意见先感谢您。

Answer 1

如果有其他人遇到这个问题，那也有类似的问题，我设法通过玩这两个帖子中的代码来解决我的问题

Example: Communication between Activity and Service using Messaging
How to keep the android client connected to the server even on activity changes and send data to server?

使用服务通过套接字连接发送/接收数据。

1 个答案: